JP3226171U - Castors with rubber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caster provided with a caster capable of horizontally moving a floor surface and a slip stopper at the time of rubber foot specification, and selectively using a movable state and an immovable state. SOLUTION: The center of the bottom of the rubber foot includes a caster main body 9 having a ball provided at the lower end to be rollable, a housing 14 for accommodating the caster main body, and rubber feet 16 covering the entire bottom portion of the housing. A central opening is formed in the portion, and in a state where the caster body is accommodated inside the housing, at least a part of the ball is provided so as to project downward from the rubber foot bottom surface through the central opening. The caster body has a positioning structure with respect to the housing, and is between a protruding posture in which at least a part of the ball projects below the bottom surface of the rubber foot and a retracted posture in which the ball retracts above the bottom surface of the rubber foot. It further includes a positioning structure for positioning so as to be switchable with. [Selection diagram] Fig. 4

Description

This invention relates to a caster with rubber.

BACKGROUND ART Conventionally, there is known a caster that can be changed to caster movement and fixed use by vertically moving a sphere arranged inside an outer cylinder.

Utility model registration No. 3222610 JP-A-2016-141364

As shown in Fig. 2, casters used in conventional furniture and office chairs are golf club-shaped tadpoles, and the fulcrum shaft that supports the structure is provided outside the center position of the upper end. When the casters move in the advancing direction, the operation of aligning the casters in the same direction once rotates 360 °, so that the twisting movement (spiral movement) in the rotational direction cannot be avoided from the stop position at the start of the operation.
As shown in FIG. 2, the conventional caster 2 is a mechanism in which the support caster 4 that contacts the floor surface 3 is turned by the rotation fulcrum shaft 5 of the upper end mounting portion rotating 360 °, such as a chair. The plurality of casters 2 of FIG. At the start of this movement, the action of the circumference of the fulcrum shaft 7 occurs and a spiral rotation phenomenon occurs. Casters mounted on standing chairs that support standing work for a long time belong to surgeries such as surgeons who need exquisite and precise operating work that can only be achieved in a standing posture during business use, and belong to this. In use, this issue is serious.
With the caster 1 with rubber, you can suppress the "twist movement" that occurs when you start moving from the stop position, suppress the occurrence of vibrations and impacts, and smoothly correct and change the foot step position and move horizontally,
In addition, there is no caster 2 that can change the usage state arbitrarily by adopting a large rubber having a high anti-slip property in the purpose of holding the fixed point position.
The present invention has been made to eliminate the above drawbacks, and an object of the present invention is to provide a caster 1 with rubber capable of switching the caster between a movable state and an immovable state.

    According to a first aspect of the present invention, a caster body having a ball rotatably provided at a lower end thereof, a cylindrical side wall, a housing for housing the caster body, and an entire bottom portion of the housing are covered. A rubber foot is included, and a central opening is formed in a central portion of a bottom surface of the rubber foot. When the caster body is accommodated in the housing, at least a part of the ball is the central portion. A positioning structure that is provided so as to project downward from the bottom surface of the rubber foot through an opening, and that positions the caster body with respect to the housing, wherein the caster body is positioned at least with respect to the ball. Positioning is switchable between a projecting position in which a part of the ball projects below the bottom surface of the rubber foot and a retracting position in which the ball retracts above the bottom surface of the rubber foot. The caster with rubber further includes a positioning structure for controlling the caster.

    The invention according to claim 2 is characterized in that the positioning structure includes an engagement protrusion provided on one of an outer surface of the caster body and an inner peripheral surface of the side wall of the housing, the outer surface of the caster body, and A plurality of engagement grooves including a first engagement groove and a second engagement groove, which are provided on the other inner peripheral surface of the side wall of the housing; By switching the tip between the first engagement groove and the second engagement groove, the posture of the caster body is switched between the protruding posture and the retracted posture, claim 1 The caster with rubber described.

According to a third aspect of the present invention, the caster body has an outer peripheral surface having a large-diameter portion formed at a portion in the circumferential direction, the large-diameter portion having a larger diameter than other portions in the circumferential direction. Is provided with the plurality of engaging grooves, and the positioning structure is formed in the first engaging groove and / or the second engaging groove, and a stopper with which the engaging protrusion abuts. 3. The caster with rubber according to claim 2, further comprising an engagement pin that engages with a circumferential end of the large-diameter portion in a state in which the engagement protrusion can come into contact with the stopper.

The caster with rubber can switch the use state between the immovable state in which the position in the stopped state is held and the movable state.
As described above, it is possible to improve the comfort in use.

The caster with rubber 1 according to the present invention. It is a comparison explanatory view of the difference in the operation of the wheel shaft when starting to move from the stopped state. It is a conventional caster 2. 1 is a left front perspective view of a standing chair 8 equipped with a rubber caster 1 of the present invention. FIG. 1 is a front perspective view of the caster with rubber 1 according to the present invention as viewed from slightly above. FIG. 3 is a bottom partial cross-sectional view of the caster body 9 of the caster with rubber 1 of the present invention. 1 is a plan view of a housing body 14 of a caster 1 with rubber of the present invention. It is a front view of the caster body 9 of the caster 1 with rubber of the present invention. FIG. 3 is a front perspective view of the caster body 9 of the caster 1 with rubber of the present invention, which is slightly elevated from below. FIG. 3 is a partial cross-sectional view of the caster with rubber 1 according to the present invention as viewed from the front, showing a state in which the caster with rubber 1 is used as a rubber foot 16 (withdrawal posture). FIG. 3 is a partial cross-sectional view of the caster with rubber 1 according to the present invention as viewed from the front, showing a usage state as a ball 17 specification (projecting posture). FIG. 3 is a front perspective view of the housing body 14 of the caster with rubber 1 of the present invention seen from slightly above. It is a bottom view of the housing body 14 of the caster with rubber 1 of the present invention. FIG. 3 is a front perspective explanatory view showing a direction in which the caster main body 9 is attached to the housing main body 14 of the caster 1 with rubber of the present invention, seen from slightly above. FIG. 14 is a plan view of FIG. 13 as seen slightly from the front. FIG. 15 is a plan view of the caster main body 9 of FIG. 14 rotated forward by 90 ° and releasably engaged with an engagement pin 13 as viewed from the front.

Hereinafter, a mode for carrying out the present invention will be described with reference to FIGS. 1 to 15.
FIG. 1 shows a caster 1 with rubber according to the present invention. FIG. 2 shows a conventional caster 2. FIG. 3 is a left front perspective view of the standing chair 8 in which the caster 1 with rubber of the present invention is mounted and is in use as a ball 17 specification (protruding posture). FIG. 4 is a front perspective view of the caster with rubber 1 of the present invention seen from slightly above.
The rubber caster 1 includes means for releasably engaging the caster body 9 arranged in an up-and-down motion inside and a plurality of horizontally-shaped members arranged in upper and lower outer circumferences of the caster body 9, which will be described later. Formed in the large diameter of the outer surface of the outer peripheral frame of the mating grooves 12A, 12B and the housing body 14 (hereinafter, the "housing body" is an assembly of components, and the "housing" may be used separately as a single component). By means of the engaging projection 15 of the housing, a means for moving the ball 17 up and down by a fixed amount of extension is provided.
In the caster 1 with rubber, when the ball 17 specification (protruding posture), the 360 ° freely movable area 6 is secured from the stopped state of the floor surface 3 to suppress vibration, impact, and swirl rotation, and move horizontally smoothly. Equipped with means. This supports precise operation work such as surgeon's standing work of finger cutting, which can be achieved only by mounting casters with rubber 1 on the standing chair 8 etc., and slightly raises the standing position of one's legs. It becomes an effective means when making changes. Standing chair 8 is a standing chair 8 for the purpose of supporting long standing work and being able to comfortably perform, and it has been generated in the conventional technology by mounting caster 1 with rubber and using it with ball 17 specifications. It is characterized by being released from the spiral rotation phenomenon.

FIG. 5 is a partial cross-sectional bottom view of the caster body 9 of the caster 1 with rubber according to the present invention. FIG. 6 is a plan view of the housing body 14 of the caster 1 with rubber. 5 and 6 are configuration diagrams of the caster 1 with rubber according to the present invention. FIG. 7 is a front view of the caster body 9 of the caster with rubber 1 of the present invention. FIG. 8 is a front perspective view of the caster body 9 of the caster 1 with rubber according to the present invention, which is slightly elevated from below. FIG. 9 is a partial cross-sectional view of the caster with rubber 1 according to the present invention as viewed from the front, showing a state in which the caster 1 with rubber is used as the rubber foot 16 (withdrawn posture). FIG. 10 is a partial cross-sectional view of the caster with rubber 1 of the present invention as viewed from the front showing a usage state as a ball 17 specification (protruding posture). FIG. 11 is a front perspective view of the housing body 14 of the caster 1 with rubber according to the present invention as seen from slightly above. FIG. 12 is a bottom view of the housing body 14 of the rubber caster 1 of the present invention.

The configuration of the rubber caster 1 will be described. As shown in FIGS. 5 and 6, the caster 1 with rubber has a caster body 9 having a ball 17 rotatably provided at the lower end, and a housing body 14 having a cylindrical side wall 28. A housing body (14) for housing the housing body (9), rubber feet (16) for covering the bottom of the housing body (14), and a positioning structure for positioning the caster body (9) with respect to the housing body (14) are included. A center opening 22 is provided at the center of the bottom surface of the rubber foot 16 in order to allow a ball 17 to be described later to be projected in a ball specification (projection posture).
That is, the caster 1 with rubber is roughly divided into a housing body 14 integrated with the rubber feet 16 and a caster body 9 having a circular shape that rotates the inner diameter of the side wall of the housing body 14 in the circumferential direction. The housing body 14 has a cylindrical shape. The housing body 14 has an outer circumference of, for example, about φ65 to 68 mm, and the total length is preferably about 30 to 35 mm. An engagement protrusion 15 is provided on the outer peripheral wall of the housing body 14.

A pair of engagement protrusions 15 of the housing body 14 are provided at positions of the housing body 14 that face each other. Each engagement protrusion 15 has an arc shape. A housing space 30 for housing the caster body 9 is defined inside the housing body 14. The planar shape of the accommodation space 30 is a shape obtained by removing a pair of arcuate engagement projections 15 facing each other from a circle. The planar shape of the accommodation space 30 is similar to the planar shape of the caster body 9 and is slightly larger than the planar shape of the caster body 9. Therefore, the caster body 9 can be fitted into the accommodation space 30 from above.
The bottom surface of the rubber foot 16 has a large disk shape. For example, about φ80 mm is desirable. As a result, the rubber foot specification (withdrawal posture) has a floor surface holding performance with a high anti-slip effect.

The configurations of the caster body 9 and the housing body 14 of the caster 1 with rubber will be described with reference to FIGS. 5 to 8. The caster body 9 includes a cylindrical body 23, a large diameter portion 11, a plurality of engagement grooves 12A and 12B, a circumferential cylindrical surface 21, a set screw 20, a ball 17, and a ball holding portion 29. And a stopper 19. The housing body 14 includes a rubber foot 16, a housing 14, an engaging projection 15 formed on the outer surface (outer peripheral surface) of the housing 14, a cylindrical side wall 28, a housing space 30, and a central opening 22. And an engagement pin 13.
The caster body 9 has a shape in which two large-diameter portions 11 are provided at positions opposite to each other on the side surface of the cylindrical body 23. Each of the large-diameter portions 11 of the caster body 9 has two-stage engagement grooves 12A, 12B including an upper groove 12A (first engagement groove) and a lower groove 12B (second engagement groove). .. The groove width of each engagement groove 12A, 12B is slightly larger than the thickness of each engagement protrusion 15. The bottoms of the individual engagement grooves 12A and 12B are flush with the outer peripheral surface of the cylindrical body 23.
On the outer circumference of the cylindrical body 23, a circular cylindrical surface 21 is formed on both sides orthogonal to the large diameter portion 11. In the caster body 9, a ball holding portion 29 for accommodating the balls 17 is arranged at the center of the bottom surface portion, and is fixed with a set screw 20.
The positioning structure is such that at least a part of the ball 17 projects downward from the bottom surface of the rubber foot 16 through the central opening 22 (hereinafter, sometimes referred to as “ball specification”), and the ball 17 is made of rubber. Switching is performed between a retracted posture in which the legs 16 are retracted above the bottom surface (hereinafter, may be referred to as “rubber foot specifications”). The plurality of engagement grooves 12A and 12B, which are characterized by a two-step shape, are formed in a horizontal state. The upper groove 12A of the plurality of engagement grooves 12A, 12B is for a ball 17 specification for horizontally moving the floor surface, and the lower groove 12B is for a rubber foot 16 specification for holding the floor surface at a fixed position without slipping.
The difference in distance between the upper and lower grooves of the plurality of engagement grooves 12A and 12B, which are characterized by a two-step shape, is preferably about 6 mm, for example.
In this embodiment, the positioning structure includes an engagement protrusion 15 formed on the outer surface (outer peripheral surface) of the housing 14 and a plurality of engagement grooves 12A, 12B formed on the inner peripheral surface of the side wall of the caster body 9. including.
According to this embodiment, the plurality of engagement grooves 12A and 12B of the caster body 9 are attached to the upper groove 12A (first engagement groove), the lower groove 12B (second engagement groove), and the housing body 14. And the engagement pin 13 is provided. The engagement pin 13 engages with the caster body 9 so that the rotation of the caster body 9 in the circumferential direction can be released.

As shown in FIG. 9 and FIG. 10, it is suitable for the ball 17 to protrude from the central opening 22 at the center of the bottom surface of the rubber foot 16 formed in the housing 14 (ball feeding distance 25) or to be stored inside the rubber foot 16. ing. With the rubber feet 16 specification, a payout allowance width 18 is secured when the ball 17 is stored. For example, about 3 mm is desirable. This prevents accidental accidents due to accidental contact with the floor.
As shown in Figs. 9 to 12, when the rubber feet 16 specification (withdrawal attitude) and the ball 17 specifications (protruding attitude) are used, the total length of the ball specification 26 and the rubber feet specification 27 is the total distance. (Height) are equal. The feature is that the user does not feel uncomfortable because the total length (height) does not change even if the specifications are changed when the standing chair 8 is used.

A method of attaching the caster body 9 to the housing body 14 will be described with reference to FIGS. 13 to 15. FIG. 13 is a front perspective explanatory view showing a direction in which the caster body 9 is attached to the housing body 14 of the caster 1 with rubber according to the present invention, as viewed from slightly above. FIG. 14 is a plan view of FIG. 13 seen from a little front side. FIG. 15 is a plan view seen from the front, showing a state in which the caster body 9 of FIG. 14 is rotated 90 ° in the forward rotation circumferential direction and is releasably engaged with the engagement pin 13.
Large diameter portions 11 are formed on the outer peripheral surface of the caster body 9 at two locations in the circumferential direction. The two large diameter portions 11 are provided so as to be displaced from each other by 180 ° in the circumferential direction. The plurality of engagement grooves 12A and 12B including the upper groove 12A and the lower groove 12B are formed on the outer circumference of each large diameter portion 11.
The positioning structure further includes a stopper 19 which is formed in the upper groove 12A and the lower groove 12B and which the engaging protrusion 15 can contact. The engagement pin 13 engages with the circumferential end of the large diameter portion 11 in a state where the engagement protrusion 15 is in contact with the stopper 19.

As shown in FIGS. 13 and 14, the caster body 9 is fitted into the accommodation space 30 from above.
At this time, the engagement pin 13 needs to be released from fixing. In this state, the engagement groove at the engagement destination of the engagement projection 15 of the housing body 14 is selected from the upper groove 12A and the lower groove 12B, and the engagement projection 15 is engaged with the selected engagement groove. Then, while visually confirming that the engagement protrusion 15 is along the plurality of engagement grooves 12A, 12B of the caster body 9, the caster body 9 is rotated about 90 ° to the normal rotation circumferential stop position. Let In this state, the respective engagement protrusions 15 engage with the corresponding engagement grooves 12A and 12B, so that the caster body 9 can be prevented from coming off from the housing body 14. Then, at the end of the rotation, the engagement pin 13 engages, whereby the rotation of the caster body 9 with respect to the housing body 14 is blocked. A stopper 19 is formed on the caster body 9 to prevent the caster body 9 from falling off. The stopper 19 is formed only on one side of each of the plurality of engagement grooves 12A, 12B of the caster body 9. By arranging the stopper 19 at a position 180 ° from the engagement pin 13, positioning of the caster body 9 with respect to the housing body 14 can be achieved at two positions.
As described above, according to this embodiment, the caster body 9 is arranged so as to be able to urge downward from the center of the inside of the housing body 14, and optionally the ball 17 specification (protruding attitude) and the rubber foot 16 specification (retracting attitude), Can be used safely, reliably and comfortably.

1 Castors with rubber
2 Conventional casters
3 floor
4 support casters
5 Rotating fulcrum shaft of the upper end mounting part
6 360 ° free movable area
7 Circumference of fulcrum axis
8 standing chair
9 Caster body (including a cylindrical body 23, a large diameter portion 11, a plurality of engagement grooves 12A.12B, a circumferential cylindrical surface 21, a set screw 20, a ball 17, a ball holding portion 29, and a stopper 19)
10 Post mounting screw holes
11 Large diameter part
12A upper groove
12B lower groove
13 Engagement pin
14 Housing body (housing) (including rubber foot 16, housing 14, engagement protrusion 15, cylindrical side wall 28, accommodation space 30, central opening 22, engagement pin 13)
15 Engagement protrusion
16 rubber feet
17 balls
18 Feeding margin
19 Stopper
20 set screw
21 Circular cylindrical surface
22 Central opening
23 cylinder
24 Tip of engaging pin 13
25 Ball feeding distance (distance from bottom of rubber foot 16 to bottom edge of ball)
Total length with 26 balls
27 Length with rubber feet
28 Cylindrical side wall
29 Ball holder
30 storage space

Claims (3)

A caster body having a ball provided at its lower end for rolling freely,
A housing having a cylindrical side wall and accommodating the caster body;
A rubber foot covering the entire bottom of the housing,
A central opening is formed in the central portion of the bottom surface of the rubber foot,
In a state where the caster body is housed inside the housing, at least a part of the ball is provided so as to be able to project downward from the bottom surface of the rubber foot through the central opening.
A positioning structure for positioning the caster body with respect to the housing, wherein the caster body has a projecting posture in which at least a part of the ball projects below the bottom surface of the rubber foot, and the ball has the rubber foot. The caster with rubber, further including a positioning structure that is switchably positioned between a retracted posture that retracts above the bottom surface. The positioning structure is
An engagement protrusion provided on one of the outer surface of the caster body and the inner peripheral surface of the side wall of the housing;
A plurality of engagement grooves including a first engagement groove and a second engagement groove provided on the other of the outer surface of the caster body and the inner peripheral surface of the side wall of the housing,
By switching the engagement destination of the engagement protrusion between the first engagement groove and the second engagement groove, the posture of the caster main body can be changed between the protrusion posture and the retracted posture. Switch between,
The caster with rubber according to claim 1. On the outer peripheral surface of the caster body, a large-diameter portion having a larger diameter than other portions in the circumferential direction is formed in a part in the circumferential direction,
The large-diameter portion is provided with the plurality of engagement grooves,
The positioning structure is
A stopper that is formed in the first engagement groove and / or the second engagement groove, and in which the engagement protrusion abuts,
In a state where the engaging protrusion can contact the stopper,
An engagement pin that engages with a circumferential end of the large-diameter portion is further included.
The caster with rubber according to claim 2.

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